JPH07105604A - Rotation driving device for disk - Google Patents

Abstract

PURPOSE:To obtain a rotation driving device for disk preventing the generation of positional deviation of the disk when the disk is chucked on a hub base and also having satisfied assemling ability. CONSTITUTION:The hub base 4 is provided with a projecting part 4a protruded in the outer peripheral direction from the disk-shaped base part. This projecting part 4a is laid over the arm part 8 of a driving pin body 9 and also a center hub is thereby positionally controlled in the state such that the positioning surface of the projecting part 4a is abutted on the side of the driving pin body 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotation drive device, and more particularly to a chucking structure when a disk is placed.

[0002]

2. Description of the Related Art As a rotary drive device for rotationally driving a floppy disk, for example, there is one shown in FIG. In FIG. 40, the substrate 57 has a hole formed in the center thereof, and a thrust bearing 58 is attached to the hole. A bearing housing 60 is attached to the outer circumference of the thrust bearing 58. The bearing housing 60 has a cylindrical shape, and the bearing 59 is attached to the inner peripheral surface thereof. A hole is formed in the center of the bearing 59, and the rotary shaft 43 is inserted into this hole. The lower end of the rotary shaft 43 inserted through the bearing 59 contacts the thrust bearing 58 and is supported in the thrust direction. The rotating shaft 43 is supported by bearings 59 in the radial direction and is rotatable.

The lower end surface of the outer periphery of the bearing housing 60 has a brim shape, and the lower end surface of this brim portion is the substrate 57.
Is in contact with. The inner peripheral edge of the stator core 54 is placed on the upper end surface of the brim-shaped portion.

The stator core 54 is constructed by laminating a plurality of core plates, a plurality of salient poles are formed on the outer circumference, and a coil 55 is wound around each salient pole.
A spacer 56 is interposed between the stator core 54 and the substrate 57. A screw 61 is inserted from one surface of the stator core 54, and the screw 61 penetrates the spacer 56 and is screwed into the substrate 57. The stator core 54 is pressed and fixed to the board 57 side by the head of the screw 61, and the upper end surface of the flange-shaped portion of the bearing housing 60 is pressed and fixed to the board 57 side by the stator core 54. ing.

A hub base 44 on which a disk or the like is placed is attached to the upper end of the rotary shaft 43. A cup-shaped rotor case 52 is attached to the lower end of the outer periphery of the hub base 44 by caulking or the like. A ring-shaped drive magnet 53 is attached to the inner surface of the peripheral wall of the rotor case 52. The inner peripheral surface of the drive magnet 53 faces the salient poles of the stator core 54 with a certain gap. For this reason, by energizing the coil 55 wound around the salient pole, the driving magnet 53 is biased, and the rotor case 52, the hub base 44, and the rotating shaft 43 are rotationally driven.

On the other hand, the hub base 4 is mounted on the upper surface of the rotor case 52.
A chucking magnet 45 for adsorbing the center hub of the floppy disk and mounting it on the hub base 44 is attached to the outer periphery of 4.

Next, a chucking structure of the above-described disk rotation driving device will be described. 40 and 4
In FIG. 1, two holes 52 a and 52 b are formed on the upper end surface of the portion protruding upward of the rotor case 52 and on the outer peripheral side of the hub base 44. Similarly, a ring-shaped chucking magnet 45 is attached to the upper end surface of the upper portion of the rotor case 52. A hole 45a is formed in the chucking magnet 45 at a portion overlapping the hole 52a, and the hole 45a and the hole 52a communicate with each other. Further, the chucking magnet 45 has a shape that protrudes outward while avoiding the hole 52b of the rotor case 52.

On the other hand, on the back side of the portion of the rotor case 52 on which the chucking magnet 45 is placed, an arcuate arm portion 49 is attached by a fulcrum 48 so that it can swing into the hole 52a. A drive pin 47 is attached to the other end of the arm 49, and the tip of the drive pin 47 projects upward from the hole 52b. Since the diameter of the hole 52b is set to be relatively large, the driving pin 47
Is freely movable in the hole 52b.

The hub base 4 of the rotor case 52 as described above
When a disk or the like is placed on the disk 4, the rotary shaft 43 engages with the center hole 41a of the center hub 41 of the floppy disk, and the rotor case 52 rotates to drive the drive pin 47 protruding from the rotor case 52. It is engaged with the window hole 41b of the center hub 41. Window hole 41b
Since the diameter of the drive pin 47 is considerably larger than that of the drive pin 47, the drive pin 47 rattles in the window hole 41b. However, when the rotor case 52 further rotates, the drive pin 47 is opened in the window hole 41b. The disk center hub 41 is brought into contact with the inner wall surface, the disk center hub 41 is positioned with respect to the hub base 44, and the disk chucking is completed. Thereafter, as the rotor case 52 further rotates, the center hub 41 pushes the wall surface in the window hole 41b, and the center hub 4 is pushed.
The disk on the outer periphery of 1 is rotationally driven.

[0010]

In the above-described disk rotation drive device, the disk is positioned with respect to the hub base 44 of the center hub 41 by the diameters of the rotation shaft 43 and the drive pin 47, the rotation shaft 43 and the fulcrum. It is determined by the distance of 48 and the distance between the fulcrum 48 and the drive pin 47. However, rattling is formed at the fulcrum 48 for swinging the arm 49, and the rotary shaft 43 and the drive pin 4 are also formed.
Since the members such as 7 and the fulcrum 48 are attached by press fitting, caulking, etc., it is not possible to obtain a high precision of the attaching position, and the distances between the respective parts, the diameter dimension and the like vary. Further, since various discs are attached to and detached from the disc rotation drive device, there are variations in the distance and size of the center hole 41a of the disc center hub 41 and the window hole 41b. When the variation occurs, the rotational position of the disk mounted on the hub base 44 is deviated, and in the worst case, the disk cannot be read.

Further, in the disk rotation driving device as in the above-mentioned conventional example, the drive pin 47, the arm portion 49, and the fulcrum 48 are provided on the surface of the rotor case 52 opposite to the side where the chucking magnet 45 and the like are attached. Since it is a structure to be attached by
Assemblability is poor and productivity is significantly reduced.

The present invention has been made to solve the above problems, and prevents the position of the disc from being displaced when the disc is chucked on the hub base.
Moreover, it is an object of the present invention to provide a disk rotation drive device which is easy to assemble.

[0013]

The invention according to claim 1 is
A rotating shaft that fits in the center hole of the center hub of the disc,
A hub base that rotates integrally with the rotating shaft, a chucking magnet that is arranged around the hub base to attract the center hub by magnetic force, and a window that is provided at a position eccentric to the center hole of the center hub. A rotary drive device for a disk, comprising: a drive pin body having a drive pin that engages with a hole and an arm portion; and a holding member on which the drive pin body is placed, wherein the hub base comprises a disk-shaped base portion. It has a protruding portion protruding in the outer peripheral direction, and this protruding portion covers the arm portion of the drive pin body and restricts the position of the center hub with the side surface of the drive pin abutting the positioning surface of the protruding portion. Characterize.

According to a second aspect of the present invention, a convex portion is formed on one side of a surface where the protruding portion of the hub base and the arm portion of the drive pin body face each other, and a concave portion is formed on the other side. It is characterized in that the convex portion and the concave portion are engaged with each other.

The invention according to claim 3 is characterized in that a convex portion rising in the axial direction is formed on the holding member, and the convex portion is engaged with a concave portion or a through hole provided in the arm portion of the drive pin body. To do.

According to a fourth aspect of the invention, the angle θ of the positioning surface with respect to the line connecting the center of the drive pin and the center of the rotary shaft
Is set to 42.8 ° ≤ θ ≤ 76.7 °.

According to a fifth aspect of the present invention, the positioning surface of the protruding portion of the hub base is flat, and the contact surface of the drive pin that contacts the positioning surface of the protruding portion of the hub base is flat. To do.

According to a sixth aspect of the present invention, a spring-shaped convex portion is formed on the arm portion of the drive pin body, and the drive pin is attached to an end surface of the convex portion.

[0019]

The projecting portion formed on the outer periphery of the hub base covers the arm portion of the drive pin body to which the drive pin is attached to prevent the drive pin body from coming off. When the disk is placed, the side surface of the drive pin comes into contact with the positioning surface of the protrusion to position the drive pin, and thereby the disk is also positioned.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk rotation drive device according to the present invention will be described below with reference to the drawings. The basic structure of the disk rotation driving device is almost the same as that of the conventional technique, and therefore the description thereof will be omitted. Here, only the chucking structure of the disk will be mainly described.

In FIGS. 1 to 3, a cup-shaped rotor case 12 is fitted and fixed to the tip of the rotary shaft 3. The center portion of the rotor case 12 projects upward by drawing, and the hub base 4 for mounting a disk or the like is attached to the upper end surface of the projecting portion. Most of the outer shape of the hub base 4 has a substantially circular shape, but an outward protruding portion 4a is formed in a part thereof. On the other hand, a chucking magnet 5 for attracting a disk mounted on the hub base 4 is attached to the surface of the rotor case 12 on the outer peripheral side of the protruding portion and lower than the protruding portion. A hole 5a is formed in the center of the chucking magnet 5. The hole 5a is formed along the outer periphery of the hub base 4, and the portion facing the protrusion 4a is fan-shaped and widens.

The drive pin body 9 is arranged in the fan-shaped portion of the hole 5a. The drive pin body 9 includes an arc-shaped arm portion 8 and a drive pin 7 attached to one end of the arm portion 8. The drive pin body 9 is the drive pin 7 of the arm portion 8.
The hole 8a formed at the opposite end to the rotor case 1
It is attached by being fitted to the convex portion 12a protruding from the upper end surface of the second member 2. The diameter of the hole 8a fitted into the protrusion 12a is set to be considerably larger than the outer diameter of the protrusion 12a, as shown in FIG. You can move freely within the range. Also, the drive pin body 9
As shown in FIG. 3, the central part or a part of the part is covered with the projecting part 4a, which prevents the projecting part 12a from coming off the hole 8a. Furthermore, since the outward rotation of the drive pin body 9 around the convex portion 12a is restricted by the wall surface defining the hole 5a of the chucking magnet 5, the drive pin body 9 is fixed to the projecting portion 4a.
The convex portion 1 of the drive pin body 9 is limited to the range covered by
It is prevented from falling off from 2a.

When the rotor case 12 rotates in the direction of arrow R shown in FIG. 1, the protrusion 4a contacts the drive pin 7 by the center hub 1 and pushes the drive pin 7 in one direction to lock the drive pin 7 at a fixed position. The rotor case 12 constitutes a holding member on which the drive pin body 9 is placed.

When the drive pin 7 is locked by the protrusion 4a,
From the relationship between the head pressure and position on the disk, the rotational torque of the disk, and the positioning force when the center hub 1 is chucked, the line connecting the drive pin 7 and the rotary shaft 3 and the drive pin 7 of the protrusion 4a are The angle θ with the abutting surface is set to fall within the range of 42.8 ° to 76.7 °. More specifically, in FIG. 7, the general nominal value of the head load pressure is 7 to 9 gr, and the actual measured value of the head load pressure is 10 to 11 gr. The actually measured value (dynamic frictional force FH between the disk and the head) when the disk is in contact with the head is 6 to 7 gr. The disk rotation torque is nominally 5 to 25 when the head is not in contact.
It is g.cm. Reference symbol F indicates a force acting on the pin hole. Since the reaction force Fx of the dynamic friction force FH between the disk and the head is obtained by FH × L1 / 8, the value of Fx is 16.5.
~ 32.4 gr. Since the positioning force Fy of the drive pin 7 is generally determined to be 30 to 70 gr and F '= Fx + Fy, the angle θ0 formed by F'and Fx is 42.8 ° to 76. This is a range of 7 °, which is an appropriate range of the angle formed by the line connecting the drive pin 7 and the rotary shaft 3 and the surface of the protrusion 4a that abuts the drive pin 7. The reaction force Fx and the drive pin 7
The angle θ1 formed by the line connecting the rotation axis 3 and the rotation axis 3 is obtained by θ1 = 90 ° −θ0, and therefore the range of θ1 is 13.3 ° to 4 °.
It will be in the range of 7.2 °.

When the disk is placed on the hub base 4, the rotary drive device for a disk having the above-described structure directly abuts the drive pin 7 on the protruding portion 4a of the hub base 4 and locks it. Since the positioning is performed, the positioning structure is simpler than that of the conventional disk rotation drive device. Therefore, the number of parts can be reduced, and the assembly requiring precision requires the rotary shaft 3 and the hub. Since only the table 4 is provided, it is possible to significantly improve the assembly accuracy. The parts other than the rotary shaft 3 and the hub base 4 do not need to have high parts accuracy, so the parts cost can be kept low. Even when deploying such a motor rotation drive device to other models, since the drive pin 7 can be positioned regardless of the rotor case, there is no need to create a new mold to make the rotor case, The cost can be reduced. Further, unlike the conventional example, since the drive pin body 9 and other parts are not attached to the surface of the rotor case 12 opposite to the hub base 4, it is possible to assemble from one direction side. The productivity of the device can be significantly improved. Further, since the drive pin 7 can move on the positioning surface of the protruding portion 4a of the hub base 4, variations in the center hub 1 can be absorbed and various discs can be dealt with.

Next, various modified embodiments will be described.
As shown in FIG. 4, the window hole 13 may be formed by punching out the portion of the drive pin body 9 of the rotor case 12 located below the arm portion 8. By doing so, the area of the contact portion between the drive pin body 9 and the rotor case 12 becomes small, and thus it becomes possible to reduce the sliding loss.

Further, as shown in FIGS. 5 and 6, the portion of the drive pin 7 that contacts the protrusion 4a is a flat portion 7a, and the portion of the protrusion 4a that contacts the drive pin 7 is a flat portion 4b. When the pin 7 is positioned, these flat parts 7
The a and the flat portion 4b may be in surface contact with each other. This improves wear resistance, increases the number of times the disc is attached and removed, and achieves high reliability.
It is possible to obtain a long-life disk rotation drive device.

The chucking structure as described above is
As shown in FIG. 8, the rotor case 12 is centered on the substrate.
It may be formed on the opposite side.

When the disk is placed on the hub base 4, the portion where the drive pin 7 is brought into contact with and locked for positioning is not limited to the protruding portion 4a of the hub base 4. For example, as shown in FIGS. 42 and 43, the rotor case 12
Forming a quadrangular hole 12g on the upper end surface of each of the positioning surfaces 12f by raising one edge of the hole 12g upward.
Then, the drive pin 7 may be brought into contact with the positioning surface 12f and locked to position it. Alternatively, FIG.
As shown in FIG. 4 and FIG. 45, a square hole 12g is formed on the upper end surface of the rotor case 12, and the drive pin 7 is formed.
The drive pin 7 may be positioned by forming a protrusion 7b in the lower part of the above, inserting the protrusion 7b into the hole 12g, and contacting the wall surface of the hole 12g.

As a structure for preventing the drive pin body 9 from coming off, as shown in FIG. 9, a lower portion of the outer peripheral portion of the hub base 4 is cut out to form a step, and the stepped portion is cut out. The drive pin body 9 may be provided to prevent the drive pin body 9 from coming off at the eave-shaped portion of the outer peripheral portion of the hub base 4. On the contrary, as shown in FIG. 10, the drive pin body 9 is cut out in the thickness direction to form a stepped shape, and this stepped portion is formed on the hub base 4
The drive pin body 9 may be prevented from coming off by being covered with the outer peripheral portion. Further, as shown in FIG. 11, the drive pin body 9 may be disposed below the hub base 3a integrally formed with the rotary shaft 3 to prevent the drive pin body 9 from coming off.

Further, in the above embodiment, the drive pin body 9 is supported by the convex portion 12a of the rotor case 12 so as to be movable, but it is also possible to support the drive pin body 9 by the hub base 4. . For example, as shown in FIGS. 12 and 13, the protruding portion 4 a of the hub base 4 has an elliptical upward convex portion 4 a.
e is formed, a long hole 9a is formed on the drive pin body 9 side, and the convex portions 4e are fitted into the long hole 9a so as to play a role of a regulation range of the operation of the drive pin body 9. May be. In addition, in order to allow the drive pin body 9 to move freely, the elongated hole 9a into which the convex portion 4e is inserted has the convex portion 4a.
It is formed to be slightly larger than the outer shape of e and is configured to cause rattling.

The shape of the convex portion 4e formed on the hub base 4 is arbitrary. For example, as shown in FIGS. 14 and 15, two circular convex portions 4d are formed integrally with the projecting portion 4a of the hub base 4 so as to be close to each other. You may make it fit in the hole 9a. Further, the circular convex portions 4d and 4d do not necessarily have to be integrally molded with the hub base 4, and, for example, as shown in FIGS.
Two protrusions 1 made of separate members are provided on the protrusion 4a of the hub base 4.
You may insert-mold 5 and 15.

Alternatively, as shown in FIGS. 16 and 17,
An oblong hole 4f is formed in the protruding portion 4a of the hub base 4, and an elliptical convex portion 9b smaller than the hole 4f is formed on the drive pin body 9 side to form the hole 4f and the convex portion 9b. You may comprise so that it may fit and it may play the role of the regulation range of the operation of the drive pin body 9.

As shown in FIGS. 20 and 21, a drive pin body 9 is formed by pressing a metal plate material, and a convex portion 9b is formed on the drive pin body 9 by burring or the like. The drive pin body 9 may be supported by fitting 9b into the hole 4f of the hub base 4. The drive pin 7 may be made of resin 16 as shown in FIGS. 24 and 25.

Alternatively, as shown in FIGS. 22 and 23,
The drive pin body 9 is formed by pressing a metal plate material, and the drive pin body 9 is formed with a long hole 9a by pressing or the like, and the projection 4a of the hub base 4 is formed downward with respect to the long hole 9a. The drive pin body 9 may be supported by fitting the formed convex portions 4e. In this case also, drive pin 7
May be made of resin 16 as shown in FIGS.

Next, still another embodiment of the chucking structure applied to the disk rotation driving device will be described. 28 and 29, a front rear circular hole is formed in the center of the chucking magnet 5 attached to the upper end surface of the rotor case 12, and the hub base 4 is attached inside the hole. There is. The hub base 4 is formed with two radially outwardly projecting portions 4a and 4a '. Projections 4g and 4g 'are formed on the surfaces of the protrusions 4a and 4a' on the rotor case 12 side, respectively. On the other hand, the drive pin body 19 is arranged below the two protruding portions 4a and 4a '. The drive pin body 19 has a partial arc shape, and the arm 1
3 and a drive pin 18 attached to the center of the arm 13. The arm 13 has holes 13 on both sides.
a and 13a 'are formed, and the drive pin 18 is located between the protrusions 4a and 4a'. Holes 13a, 13a '
The convex portions 4g and 4g ′ of the hub base 4 are inserted in the hub. Since the holes 13a and 13a 'are set to be larger than the diameter of the protrusions 4g and 4g', the drive pin body 19 slides and the drive pin 18 can move within a certain range. The drive pin body 19 may be formed integrally with the drive pin 18, the drive pin 18 may be insert-molded with resin or the like, or a metal plate may be formed by pressing.

The disk chucking structure as described above is formed on the hub base 4 in the same manner as in the above-mentioned embodiment, and the projections 4a and 4a 'are directly brought into contact with the drive pin 18 to be locked and positioned. Since the positioning structure is simpler than that of the conventional one, the number of parts can be reduced, and the assembly requiring accuracy requires only the rotary shaft 3 and the hub base 4. Can be significantly improved. The parts other than the rotary shaft 3 and the hub base 4 do not need to be highly accurate, so that the manufacturing cost can be reduced. Also in this case, since the chucking structure can be formed by assembling from one side without arranging the components on the back side of the rotor case 12, it is possible to remarkably improve the productivity. Further, since the drive pin 18 can move on the positioning surface of the protruding portion 4a 'of the hub base 4, the center hub 1
It is possible to absorb the variation of and to support various discs.

As another example of the structure in which the drive pin is provided at the center of the drive pin body, as shown in FIGS. 30 and 31, the arm portion 20 constituting the drive pin body 19 is formed of a spring material. The protrusion 20a is formed at the center and the protrusion 20
There is also a structure in which the drive pin 18 is attached to the upper end surface of a. When the center hub of the disc is placed on the hub base 4, the drive pin 18 sinks downward due to the protruding portion 20a, so that when the disc is chucked, the drive pin 18 tilts and the load concentrates on a specific portion of the disc. Can be prevented. Therefore, the load on the head of the disk can be reduced and the sliding friction of the drive pin 18 on the center hub can be stabilized. As shown in FIG. 32, the recess 12 is formed in the rotor case 12 below the protruding portion 20a.
The amount of depression of the drive pin 18 may be increased by forming c.

Further, as shown in FIGS. 33 and 34, the end surface of the rotor case 12 is slightly larger than the outer shape of the arm portion 20 of the drive pin body 19, and the depth dimension L is larger than that of the arm portion 20. The recess 12d may be formed to have a thickness substantially the same as the plate thickness. Since the drive pin body 19 is movable within the range of the recess 12d, it is not necessary to form a protrusion or a recess on the hub base 4 or the drive pin body 19, and the manufacturing cost can be reduced. The regulation range by the recess 12d can be applied to each of the other embodiments described above.

As an embodiment in which the movement range of the drive pin body is restricted by the rotor case, for example, as shown in FIG.
A hole 12e having an outer diameter larger than that of the hole b is formed.
You may comprise so that the convex part 9b may be inserted in 2e. The drive pin body 9 can be moved within the range of the hole 12e. vice versa,
As shown in FIG. 36, a protrusion 12d is formed on the rotor case 12 by burring or the like, the protrusion 12d is fitted and fixed to the protrusion 4a of the hub base 4, and the protrusion 12a between the protrusion 4a and the rotor case 12 is fixed. A hole 9a formed in the drive pin body 9 is fitted in the convex portion 12d with a spatial margin, and the drive pin body 9 is inserted into the hole 9a.
It may be movable within the range of a.

Further, as shown in FIG. 37, a hole 12e may be formed in the rotor case 12, and the drive pin 27 may be directly mounted in the hole 12e. The diameter of the head portion of the drive pin 27 is set to be considerably larger than the diameter of the hole 12e, but the diameter of the portion inserted into the hole 12e is smaller than that of the hole 12e. Is set. Therefore, the drive pin 27 is movable within the range of the hole 12e. A retaining ring 28 is attached as a separate member to the drive pin 27 on the back side of the rotor case 12.
7 is prevented from coming off from the rotor case 12. With such a configuration, only the drive pin 27 can be directly attached without using the arm portion, so that the configuration of the drive pin body can be simplified and the cost can be reduced. Further, as shown in FIG. 38, the drive pin 27 is divided into a head 27a and a shaft 27b, and the head 27a
The shaft 27b may be press-fitted to be integrated with the shaft 27b so that the shaft 27b fits into the hole 12e with a spatial margin.

In the disk chucking structure described above, the rotor case 12 is directly attached to the rotary shaft 3, but in the present invention, as shown in FIG. 39, the hub base 4 is fitted to the rotary shaft 3. In addition to the fixing, the rotor case 12 can be caulked and fixed to the hub base 4. A specific portion above the caulked portion 4d of the hub base 4 may be horizontally projected to form a protruding portion 4a, and the protruding portion 4a may prevent the drive pin body 9 from coming off. Further, the rotor case 12 below the protruding portion 4a may be formed in a step shape, and the drive pin body 9 and the chucking magnet 5 may be attached to the lowered portion.

[0043]

According to the first aspect of the invention, the hub base has a protrusion protruding from the disc-shaped base in the outer peripheral direction, and the protrusion covers the arm of the drive pin body.
Since the position of the center hub is regulated in a state where the positioning surface of the protruding portion is in contact with the side surface of the drive pin body, the positioning structure is simplified and the number of parts can be reduced. Further, the assembly that requires precision is only the rotary shaft and the hub base, and it is not necessary to raise the precision of other parts so much, so that it is possible to significantly improve the assembly precision and reduce the manufacturing cost. .

According to the second aspect of the present invention, the convex portion is formed on one of the surfaces of the protruding portion of the hub base and the arm portion of the drive pin body facing each other, and the concave portion is formed on the other side thereof. Since the convex portion and the concave portion are engaged with each other, the assembling can be performed from the same direction, and the productivity can be improved.

According to the third aspect of the present invention, since the projecting portion which is erected in the axial direction is formed in the holding member and the projecting portion is engaged with the recessed portion or through hole provided in the arm portion of the drive pin body, Assembling from the same direction is possible, and productivity can be improved.

According to the fourth aspect of the invention, the angle θ of the positioning surface with respect to the line connecting the center of the drive pin and the center of the rotary shaft is set within the range of 42.8 ° ≦ θ ≦ 76.7 °. , The best positioning force can be obtained.

According to the fifth aspect of the present invention, the positioning surface of the protruding portion of the hub base is flat, and the contact surface of the drive pin that contacts the positioning surface of the protruding portion of the hub base is flat.
The protrusion and the drive pin are in surface contact with each other to improve wear resistance.

According to the sixth aspect of the present invention, since the spring-shaped convex portion is formed on the arm portion of the drive pin body and the drive pin is attached to the end surface of the convex portion, the disk is placed on the hub base. In addition, the drive pin sinks in the direction opposite to the spring-shaped convex portion, so that there is no inclination of the disk, the load on the head of the disk can be reduced, and the sliding friction of the drive pin can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of an embodiment of a motor rotation drive device according to the present invention.

FIG. 2 is a cross-sectional view taken along the line A-A ′ in FIG.

FIG. 3 is a cross-sectional view taken along the line B-B ′ in FIG.

FIG. 4 is a cross-sectional view showing another embodiment of the motor rotation drive device according to the present invention.

FIG. 5 is a plan view showing still another embodiment of the rotation driving device of the motor according to the present invention.

FIG. 6 is an enlarged plan view of an essential part of the same.

FIG. 7 is a diagram showing a force relationship exerted by contact between a drive pin and a protruding portion of a hub base in a disk rotation drive device.

FIG. 8 is a cross-sectional view showing still another embodiment of the motor rotation drive device according to the present invention.

FIG. 9 is a cross-sectional view showing still another embodiment of the motor rotation drive device according to the present invention.

FIG. 10 is a cross-sectional view showing still another embodiment of the motor rotation drive device according to the present invention.

FIG. 11 is a cross-sectional view showing still another embodiment of the rotation driving device of the motor according to the present invention.

FIG. 12 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

13 is a cross-sectional view taken along alternate long and short dash line C-C 'in FIG.

FIG. 14 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

15 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG.

FIG. 16 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

17 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG.

FIG. 18 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

19 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG. 18.

FIG. 20 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

21 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG. 20.

FIG. 22 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

23 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG. 22.

FIG. 24 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

25 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG. 24.

FIG. 26 is a plan view showing still another embodiment of the rotation driving device of the motor according to the present invention.

27 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG. 26.

FIG. 28 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

FIG. 29 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG. 28.

FIG. 30 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

31 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG. 30.

FIG. 32 is a sectional view showing still another embodiment of the motor rotation drive device according to the present invention.

FIG. 33 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

34 is a cross-sectional view taken along alternate long and short dash line C-C ′ in FIG. 33.

FIG. 35 is a sectional view showing still another embodiment of the rotation driving device of the motor according to the present invention.

FIG. 36 is a sectional view showing still another embodiment of the motor rotation drive device according to the present invention.

FIG. 37 is a cross-sectional view showing still another embodiment of the rotation driving device of the motor according to the present invention.

FIG. 38 is a sectional view showing still another embodiment of the rotation driving device of the motor according to the present invention.

FIG. 39 is a sectional view showing still another embodiment of the rotation driving device of the motor according to the present invention.

FIG. 40 is a sectional view showing an example of a conventional motor rotation drive device.

FIG. 41 is an exploded perspective view of the same.

FIG. 42 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

FIG. 43 is a cross-sectional view showing an enlarged principal part of the same.

FIG. 44 is a plan view showing still another embodiment of the motor rotation drive device according to the present invention.

FIG. 45 is an enlarged cross-sectional view showing the main part of the same.

[Explanation of symbols]

 1 Center Hub 3 Rotating Shaft 4 Hub Base 4a Projection 5 Chucking Magnet 7 Drive Pin 8 Arm 9 Drive Pin Body

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[Procedure amendment]

[Submission date] April 22, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art For example, there is a rotary drive device for rotating a floppy disk as shown in FIG. In FIG. 40, the substrate 57 has a hole formed in the center thereof, and a thrust bearing 58 is attached to the hole.
A bearing housing 60 is attached to the outer circumference of the thrust bearing 58. The bearing housing 60 has a cylindrical shape, and the bearing 59 is attached to the inner peripheral surface thereof. A hole is formed in the center of the bearing 59, and the rotary shaft 43 is inserted into this hole. The lower end of the rotary shaft 43 inserted through the bearing 59 contacts the thrust bearing 58 and is supported in the thrust direction.
The rotating shaft 43 is supported by bearings 59 in the radial direction and is rotatable.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

In the above-described disk rotation drive device, the disk is positioned with respect to the hub base 44 of the center hub 41 by the diameters of the rotation shaft 43 and the drive pin 47, the rotation shaft 43 and the fulcrum. It is determined by the distance of 48 and the distance between the fulcrum 48 and the drive pin 47. However, rattling is formed at the fulcrum 48 for swinging the arm 49, and the rotary shaft 43 and the drive pin 4 are also formed.
Since the members such as 7 and the fulcrum 48 are attached by press fitting, caulking, etc., it is not possible to obtain a high precision of the attaching position, and the distances between the respective parts, the diameter dimension and the like vary. Further, the rotary drive of the disc, for various di <br/> disk is removable, there is a variation in the distance and the size of the center hole 41a and the window hole 41b of the center hub 41 of the disc. When variations occur, deviation occurs in the rotational position of the disk to be mounted on the hub base 44, in the worst case, it is impossible that reading <br/> disk.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Further, as shown in FIGS. 5 and 6, the portion of the drive pin 7 that contacts the protrusion 4a is a flat portion 7a, and the portion of the protrusion 4a that contacts the drive pin 7 is a flat portion 4b. When the pin 7 is positioned, these flat parts 7
The a and the flat portion 4b may be in surface contact with each other. This improves wear resistance , increases the number of times the disc is attached and removed, and achieves high reliability.
It is possible to obtain a long-life disk rotation drive device.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

Further, in the above embodiment, the drive pin body 9 is supported by the convex portion 12a of the rotor case 12 so as to be movable, but it is also possible to support the drive pin body 9 by the hub base 4. . For example, as shown in FIG. 12 and FIG. 13, the protruding portion 4 a of the hub base 4 has an elliptic downward convex portion 4 a.
e is formed, a long hole 9a is formed on the drive pin body 9 side, and the convex portions 4e are fitted into the long hole 9a so as to play a role of a regulation range of the operation of the drive pin body 9. May be. In addition, in order to allow the drive pin body 9 to move freely, the elongated hole 9a into which the convex portion 4e is inserted has the convex portion 4a.
It is formed to be slightly larger than the outer shape of e and is configured to cause rattling.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction content]

According to the fifth aspect of the present invention, the positioning surface of the protruding portion of the hub base is flat, and the contact surface of the drive pin that contacts the positioning surface of the protruding portion of the hub base is flat.
The protrusion and the drive pin are in surface contact with each other, and wear resistance is improved.

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 12

[Correction method] Change

[Correction content]

[Fig. 12]

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 16

[Correction method] Change

[Correction content]

FIG. 16

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 28

[Correction method] Change

[Correction content]

FIG. 28

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 32

[Correction method] Change

[Correction content]

FIG. 32

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 33

[Correction method] Change

[Correction content]

FIG. 33

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 35

[Correction method] Change

[Correction content]

FIG. 35

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 36

[Correction method] Change

[Correction content]

FIG. 36

Claims (6)

[Claims] 1. A rotary shaft fitted into a center hole of a center hub of a disk, a hub base that rotates integrally with the rotary shaft, and a chuck arranged around the hub base to attract the center hub by magnetic force. A king magnet, a drive pin body having a drive pin and an arm portion that engage with a window hole provided at a position eccentric to the center hole of the center hub, and a holding member on which the drive pin body is mounted. In the rotation driving device for a disk, the hub base has a protrusion projecting from a disc-shaped base portion in an outer peripheral direction, and the protrusion covers the arm portion of the drive pin body and is projected. A rotational drive device for a disk, wherein the center hub is positionally regulated in a state where a side surface of the drive pin is in contact with a positioning surface of the portion. 2. A convex portion is formed on one side of a surface where the protruding portion of the hub base and the arm portion of the drive pin body face each other, and a concave portion is formed on the other side. The rotary drive device for a disk according to claim 1, wherein the rotary drive device is engaged. 3. The holding member according to claim 1, wherein an axially erected convex portion is formed, and the convex portion is engaged with a concave portion or a through hole provided in the arm portion of the drive pin body. Disk rotation drive. 4. A disk rotation drive device according to claim 1, wherein an angle θ of the positioning surface with respect to a line connecting the center of the drive pin and the center of the rotation shaft is set as follows. 42.8 ° ≤ θ ≤ 76.7 ° 5. The positioning surface of the protruding portion of the hub base is flat,
2. The disk rotation drive device according to claim 1, wherein the contact surface of the drive pin that contacts the positioning surface of the protruding portion of the hub base is flat. 6. The rotary drive device for a disk according to claim 1, wherein a spring-shaped convex portion is formed on an arm portion of the drive pin body, and the drive pin is attached to an end surface of the convex portion.